By tracking swarms of very small earthquakes, seismologists are getting a new picture of the complex region where the San Andreas fault meets the Cascadia subduction zone, an area that could give rise ...

New research challenges conventional wisdom by demonstrating that mid-ocean ridges and continental rifts, not volcanic ...

No one ever thought the birth of the Rocky Mountains was a simple process, but we now know it was far more complex than even ...

Carbon released from Earth's spreading tectonic plates, not volcanoes, may have triggered major transitions between ancient ...

Northern California’s coast keeps you on alert, even on quiet days. Offshore, three tectonic plates meet near Humboldt County ...

Life in paradise can be hard. Paradise is a Greek word of Persian origin made famous by the Jewish bible: it comes from a mix of very different cultures. The word means a walled garden. The garden ...

A hidden shard of ancient crust has been detected where California’s San Andreas system collides with the Cascadia subduction ...

Many of the state’s largest earthquakes have struck near the junction, where the Pacific, North American and Gorda plates ...

Memorizing seven continents feels settled, like learning the alphabet. A new study argues the ground rules are less tidy.

The largest domestic quake of the year occurred on July 16 centered south of the Alaska Peninsula, 53 miles south of the ...